Kim Kardashian's sleep is being disturbed by new arrival, baby Saint and she's not too happy about it.

Kim and Kanye's son who was born at the start of December, is already running his famous mum ragged, with the star taking to Twitter to complain the early morning feeds are making her "delirious".

She wrote in the early hours of Monday morning: "This 4 am feeding really kills me. I'm like delirious."

Mum-to-be Chrissy Teigen sympathised with the star, sending a crying face. To which Kim replied: "You have no idea".

Earlier Kim had been feeling a little smug about her mom abilities and boasted that she actually had some free time after getting her children off to sleep.

"wait its 8:30 my kids are bathed,fed &asleep! U have no idea what this means 2 me! I don't even know what 2 do with this free time! #momlife," she revealed.

That didn't appear to last long though.

Kim didn't look like she'd lost out on any sleep in a recent selfie posted of her and sister Kendall. You'd have no idea Mrs West is actually over 15 years older than the model from her line free face.

Kim hasn't shared a snap of her son yet, but yesterday we did have a look at Kim's post baby body.